Review "PROTO"

Consider one of the many modules for M5Stack - "PROTO" (Fig. 1). Buy it now on Aliexpress

Figure 1. The PROTO module is composed of base and finishing modules

This module is a plastic gray frame, which has means of screws circuit Board with one connector 2 to 15 (Fig. 2, 3).
On the frame on the right side (Fig. 4) there is a recess under the sticker (not included) and a cavity under a flat-blade screwdriver for easy removal of a module, because due to connector 2 of 15 modules are kept pretty tight. Left side there is a plastic grille (Fig. 4). Top and bottom three holes (Fig. 5).
Designed this module to create your own extensions for M5Stack.